Actually, it's possible to check this on-the-fly:
Typical -5V line is rated for 0.5 amps, max (may vary)
This fan is rated for 24V@ .75amps, which gives it roughly a resistance of 32 Ohms.
If we ran that fan at 17 volts, it would draw 0.53 amps (I know it's not accurate, but rough enough!), so it would overpower the -5 line.
With the +5 and -12 option, the -12 line is typically rated at 1.0 amps (may vary), so that should be OK.
The -12 to +12 should work too.
(If any ya'll try this, it's at your own risk, OK?)
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